diff options
author | Gilles Dubochet <gilles.dubochet@epfl.ch> | 2005-12-16 18:44:33 +0000 |
---|---|---|
committer | Gilles Dubochet <gilles.dubochet@epfl.ch> | 2005-12-16 18:44:33 +0000 |
commit | 53a3cc7b17f4cf97075b7e71720777fd84109696 (patch) | |
tree | 0cc784e0b47ea49cc151a136d19f20bfa8ee2197 /sources/examples | |
parent | df50e05006b43b007c2587549030d24b5c154398 (diff) | |
download | scala-53a3cc7b17f4cf97075b7e71720777fd84109696.tar.gz scala-53a3cc7b17f4cf97075b7e71720777fd84109696.tar.bz2 scala-53a3cc7b17f4cf97075b7e71720777fd84109696.zip |
Created proper 'docs' folder for new layout.
Diffstat (limited to 'sources/examples')
33 files changed, 0 insertions, 3008 deletions
diff --git a/sources/examples/Parsers.scala b/sources/examples/Parsers.scala deleted file mode 100644 index 10512ab2fd..0000000000 --- a/sources/examples/Parsers.scala +++ /dev/null @@ -1,108 +0,0 @@ -package examples; - -abstract class Parsers { - - type inputType; - - trait Parser[a] { - - type Result = Option[Pair[a, inputType]]; - - def apply(in: inputType): Result; - - def filter(pred: a => boolean) = new Parser[a] { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => None - case Some(Pair(x, in1)) => if (pred(x)) Some(Pair(x, in1)) else None - } - } - - def map[b](f: a => b) = new Parser[b] { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => None - case Some(Pair(x, in1)) => Some(Pair(f(x), in1)) - } - } - - def flatMap[b](f: a => Parser[b]) = new Parser[b] { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => None - case Some(Pair(x, in1)) => f(x).apply(in1) - } - } - - def ||| (p: => Parser[a]) = new Parser[a] { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => p(in) - case s => s - } - } - - def &&& [b](p: => Parser[b]): Parser[b] = - for (val _ <- this; val x <- p) yield x; - } - - def succeed[a](x: a) = new Parser[a] { - def apply(in: inputType): Result = Some(Pair(x, in)) - } - - def rep[a](p: Parser[a]): Parser[List[a]] = - rep1(p) ||| succeed(List()); - - def rep1[a](p: Parser[a]): Parser[List[a]] = - for (val x <- p; val xs <- rep(p)) yield x :: xs; - - def opt[a](p: Parser[a]): Parser[List[a]] = - (for (val x <- p) yield List(x)) ||| succeed(List()); -} - -class Tokenizer(in: Iterator[char], delimiters: String) extends Iterator[String] { - - val EOI: char = 0; - - def nextChar() = - if (in.hasNext) in.next else EOI; - - private var ch = nextChar(); - - def isDelimiter(ch: Char) = { - var i = 0; - while (i < delimiters.length() && delimiters.charAt(i) != ch) { i = i + 1 } - i < delimiters.length() - } - - def hasNext: boolean = ch != EOI; - - private val buf = new StringBuffer; - - def next: String = { - while (ch <= ' ' && ch != EOI) nextChar(); - if (ch == EOI) "" - else { - if (isDelimiter(ch)) ch.toString() - else { - buf.setLength(0); buf append ch; - while (ch > ' ' && ch != EOI && !isDelimiter(ch)) { - buf append ch; nextChar(); - } - buf.toString() - } - } - } -} - -abstract class TokenParsers extends Parsers { - type inputType = Stream[String]; - def nextToken() = new Parser[String] { - def apply(in: inputType): Result = - if (in.isEmpty) None else Some(Pair(in.head, in.tail)); - } -} - -abstract class CharParsers extends Parsers { - def any: Parser[char]; - def chr(ch: char) = - for (val c <- any; c == ch) yield c; - def chr(p: char => boolean) = - for (val c <- any; p(c)) yield c; -} diff --git a/sources/examples/auction.scala b/sources/examples/auction.scala deleted file mode 100644 index c6ab223375..0000000000 --- a/sources/examples/auction.scala +++ /dev/null @@ -1,133 +0,0 @@ -package examples; - -import java.util.Date; -import scala.concurrent._; - -/** A simple demonstrator program implementing an online auction service - * The example uses the actor abstraction defined in the API of - * package scala.concurrent. - */ -trait AuctionMessage; -case class - Offer(bid: int, client: Actor), // make a bid - Inquire(client: Actor) extends AuctionMessage; // inquire status - -trait AuctionReply; -case class - Status(asked: int, expiration: Date), // asked sum, expiration date - BestOffer(), // yours is the best offer - BeatenOffer(maxBid: int), // offer beaten by maxBid - AuctionConcluded(seller: Actor, client: Actor), // auction concluded - AuctionFailed(), // failed with no bids - AuctionOver() extends AuctionReply; // bidding is closed - -class Auction(seller: Actor, minBid: int, closing: Date) extends Actor { - - val timeToShutdown = 3600000; // msec - val bidIncrement = 10; - - override def run() = { - var maxBid = minBid - bidIncrement; - var maxBidder: Actor = null; - var running = true; - - while (running) { - receiveWithin (closing.getTime() - new Date().getTime()) { - - case Offer(bid, client) => - if (bid >= maxBid + bidIncrement) { - if (maxBid >= minBid) - maxBidder send BeatenOffer(bid); - maxBid = bid; - maxBidder = client; - client send BestOffer() - } else { - client send BeatenOffer(maxBid) - } - - case Inquire(client) => - client send Status(maxBid, closing) - - case TIMEOUT() => - if (maxBid >= minBid) { - val reply = AuctionConcluded(seller, maxBidder); - maxBidder send reply; - seller send reply - } else { - seller send AuctionFailed() - } - receiveWithin(timeToShutdown) { - case Offer(_, client) => client send AuctionOver() - case TIMEOUT() => running = false - } - - } - } - } -} - -// ---- Test ------------------------------------------------------------- - -object auction { - - val random = new java.util.Random(); - - val minBid = 100; - val closing = new Date(new Date().getTime() + 60000); - - val seller = new Actor { - override def run() = {} - } - val auction = new Auction(seller, minBid, closing); - - def client(i: int, increment: int, top: int) = new Actor { - val name = "Client " + i; - def log(msg: String) = Console.println(name + ": " + msg); - var running = true; - var max: int = _; - var current: int = 0; - override def run() = { - log("started"); - auction send Inquire(this); - receive { - case Status(maxBid, _) => { - log("status(" + maxBid + ")"); - max = maxBid - } - } - while (running) { - if (max >= top) - log("too high for me") - else if (current < max) { - current = max + increment; - Thread.sleep(1 + random.nextInt(1000)); - auction send Offer(current, this); - } - receive { - case BestOffer() => { - log("bestOffer(" + current + ")"); - } - case BeatenOffer(maxBid) => { - log("beatenOffer(" + maxBid + ")"); - max = maxBid; - } - case AuctionConcluded(seller, maxBidder) => { - log("auctionConcluded"); - } - case AuctionOver() => { - running = false; - log("auctionOver"); - } - } - } - } - } - - def main(args: Array[String]) = { - seller.start(); - auction.start(); - client(1, 20, 200).start(); - client(2, 10, 300).start(); - } - -} diff --git a/sources/examples/boundedbuffer.scala b/sources/examples/boundedbuffer.scala deleted file mode 100644 index 983a3a7bf5..0000000000 --- a/sources/examples/boundedbuffer.scala +++ /dev/null @@ -1,36 +0,0 @@ -package examples; - -object boundedbuffer { - - import concurrent.ops._; - - class BoundedBuffer[a](N: Int) { - var in, out, n = 0; - val elems = new Array[a](N); - - def await(cond: => Boolean) = while (!cond) { wait() } - - def put(x: a) = synchronized { - await (n < N); - elems(in) = x; in = (in + 1) % N; n = n + 1; - if (n == 1) notifyAll(); - } - - def get: a = synchronized { - await (n != 0); - val x = elems(out); out = (out + 1) % N ; n = n - 1; - if (n == N - 1) notifyAll(); - x - } - } - - def main(args: Array[String]) = { - val buf = new BoundedBuffer[String](10); - var cnt = 0; - def produceString = { cnt = cnt + 1; cnt.toString() } - def consumeString(ss: String) = System.out.println(ss); - spawn { while (true) { val ssss = produceString; buf.put(ssss) } } - spawn { while (true) { val s = buf.get; consumeString(s) } } - } - -} diff --git a/sources/examples/computeserver.scala b/sources/examples/computeserver.scala deleted file mode 100644 index acc4a0b93e..0000000000 --- a/sources/examples/computeserver.scala +++ /dev/null @@ -1,42 +0,0 @@ -package examples; - -import concurrent._, concurrent.ops._; - -class ComputeServer(n: Int) { - - private trait Job { - type t; - def task: t; - def ret(x: t): Unit; - } - - private val openJobs = new Channel[Job](); - - private def processor(i: Int): Unit = { - while (true) { - val job = openJobs.read; - Console.println("read a job"); - job.ret(job.task) - } - } - - def future[a](p: => a): () => a = { - val reply = new SyncVar[a](); - openJobs.write{ - new Job { - type t = a; - def task = p; - def ret(x: a) = reply.set(x); - } - } - () => reply.get - } - - spawn(replicate(0, n) { processor }) -} - -object computeserver with Application { - val server = new ComputeServer(1); - val f = server.future(42); - Console.println(f()) -} diff --git a/sources/examples/expressions/expressions-current.scala b/sources/examples/expressions/expressions-current.scala deleted file mode 100644 index 91e5df02ae..0000000000 --- a/sources/examples/expressions/expressions-current.scala +++ /dev/null @@ -1,67 +0,0 @@ -package examples.expressions; - -abstract class Lang { - trait Visitor { - def caseNum(n: int): unit; - } - - abstract class Exp { - def visit(v: visitor): unit; - } - - type visitor <: Visitor; - - class Num(n: int) extends Exp { - def visit(v: visitor): unit = v.caseNum(n); - } - - class Eval(result: Ref[int]): visitor extends Visitor { - def caseNum(n: int) = result.elem = n; - } -} - -abstract class Lang2 extends Lang { - abstract class Visitor2 extends Visitor { - def casePlus(left: Exp, right: Exp): unit; - } - - type visitor <: Visitor2; - - class Plus(l: Exp, r: Exp) extends Exp { - def visit(v: visitor): unit = v.casePlus(l, r); - } - - class Eval2(result: Ref[int]): visitor extends Eval(result) with Visitor2 { - def casePlus(l: Exp, r: Exp) = - result.elem = { l.visit(this); result.elem } + { r.visit(this); result.elem } - } - - class Show2(result: Ref[String]): visitor extends Visitor2 { - def caseNum(n: int) = result.elem = n.toString(); - def casePlus(l: Exp, r: Exp) = - result.elem = - "(" + { l.visit(this); result.elem } + - "+" + { r.visit(this); result.elem } + ")"; - } -} - -object Main { - - def main(args: Array[String]) = { - //val l1 = new Lang { type visitor = Visitor } // not yet implemented - object l1 extends Lang { type visitor = Visitor } // workaround - val e1: l1.Exp = new l1.Num(42); - val iref = new Ref(0); - Console.println("eval: " + { e1.visit(new l1.Eval(iref)); iref.elem }); - - //val l2 = new Lang2 { type visitor = Visitor2 } // not yet implemented - object l2 extends Lang2 { type visitor = Visitor2 } // workaround - val e2: l2.Exp = new l2.Plus(new l2.Num(5), new l2.Num(37)); - val sref = new Ref(""); - Console.println("eval: " + { e2.visit(new l2.Eval2(iref)); iref.elem }); - Console.println("show: " + { e2.visit(new l2.Show2(sref)); sref.elem }); - e1.visit(new l1.Eval(iref)); - e2.visit(new l2.Show2(sref)); - } -} - diff --git a/sources/examples/fors.scala b/sources/examples/fors.scala deleted file mode 100644 index 6c969d3519..0000000000 --- a/sources/examples/fors.scala +++ /dev/null @@ -1,114 +0,0 @@ -package examples; - -import scala.xml._; - - -object fors { - - val e = Node.NoAttributes ; - - class Person(_name: String, _age: Int) { - val name = _name; - val age = _age; - } - - def printOlderThan20(xs: Seq[Person]): Iterator[String] = - printOlderThan20(xs.elements); - - def printOlderThan20(xs: Iterator[Person]): Iterator[String] = - for (val p <- xs; p.age > 20) yield p.name; - - val persons = List( - new Person("John", 40), - new Person("Richard", 68) - ); - - def divisors(n: Int): List[Int] = - for (val i <- List.range(1, n+1); n % i == 0) yield i; - - def isPrime(n: Int) = divisors(n).length == 2; - - def findNums(n: Int): Iterator[Pair[Int, Int]] = - for (val i <- Iterator.range(1, n); - val j <- Iterator.range(1, i-1); - isPrime(i+j)) yield Pair(i, j); - - def sum(xs: List[Double]): Double = - xs.foldLeft(0.0) { (x, y) => x + y } - - def scalProd(xs: List[Double], ys: List[Double]) = - sum(for(val Pair(x, y) <- xs zip ys) yield x * y); - - type Lst = List[Any]; - - val prefix = null; - val scope = TopScope; - - val books = List( - Elem(prefix, "book", e, scope, - Elem(prefix, "title", e, scope, - Text("Structure and Interpretation of Computer Programs")), - Elem(prefix, "author", e, scope, - Text("Abelson, Harald")), - Elem(prefix, "author", e, scope, - Text("Sussman, Gerald J."))), - Elem(prefix, "book", e, scope, - Elem(prefix, "title", e, scope, - Text("Principles of Compiler Design")), - Elem(prefix, "author", e, scope, - Text("Aho, Alfred")), - Elem(prefix, "author", e, scope, - Text("Ullman, Jeffrey"))), - Elem(prefix, "book", e, scope, - Elem(prefix, "title", e, scope, - Text("Programming in Modula-2")), - Elem(prefix, "author", e, scope, - Text("Wirth, Niklaus"))) - ); - - def findAuthor(books: Lst) = - for (val Elem(_, "book", _, scope, book @ _*) <- books; - val Elem(_, "title", _, scope, Text(title)) <- book; - (title indexOf "Program") >= 0; - val Elem(_, "author", _, scope, Text(author)) <- book) yield author; - - for (val Elem(_, "book", _, scope, b @ _*) <- books; - val Elem(_, "author", _, scope, Text(author)) <- b; - author startsWith "Ullman"; - val Elem(_, "title", _, scope, Text(title)) <- b) yield title; - - removeDuplicates( - for (val Elem(_, "book", _, scope, b1 @ _* ) <- books; - val Elem(_, "book", _, scope, b2 @ _*) <- books; - b1 != b2; - val Elem(_, "author", _, scope, Text(a1)) <- b1; - val Elem(_, "author", _, scope, Text(a2)) <- b2; - a1 == a2) yield Pair(a1, a2)); - - def removeDuplicates[a](xs: List[a]): List[a] = - if (xs.isEmpty) - xs - else - xs.head :: removeDuplicates(for (val x <- xs.tail; x != xs.head) yield x); - - def main(args: Array[String]) = { - Console.print("Persons over 20:"); - printOlderThan20(persons) foreach { x => Console.print(" " + x) }; - Console.println; - - Console.println("divisors(34) = " + divisors(34)); - - Console.print("findNums(15) ="); - findNums(15) foreach { x => Console.print(" " + x); }; - Console.println; - - val xs = List(3.5, 5.0, 4.5); - Console.println("average(" + xs + ") = " - + sum(xs) / xs.length); - - val ys = List(2.0, 1.0, 3.0); - Console.println("scalProd(" + xs + ", " + ys +") = " - + scalProd(xs, ys)); - } - -} diff --git a/sources/examples/futures.scala b/sources/examples/futures.scala deleted file mode 100644 index 905d360612..0000000000 --- a/sources/examples/futures.scala +++ /dev/null @@ -1,17 +0,0 @@ -package examples; - -import concurrent.ops._; - -object futures { - def someLengthyComputation = 1; - def anotherLengthyComputation = 2; - def f(x: Int) = x + x; - def g(x: Int) = x * x; - - def main(args: Array[String]): Unit = { - val x = future(someLengthyComputation); - anotherLengthyComputation; - val y = f(x()) + g(x()); - Console.println(y) - } -}
\ No newline at end of file diff --git a/sources/examples/iterators.scala b/sources/examples/iterators.scala deleted file mode 100644 index 5f951156cf..0000000000 --- a/sources/examples/iterators.scala +++ /dev/null @@ -1,29 +0,0 @@ -package examples; - -object iterators { - - def Array(elems: Double*): Array[Double] = { - val ar = new Array[Double](elems.length); - for (val i <- Iterator.range(0, elems.length)) - ar(i) = elems(i); - ar - } - - def printArray(xs: Array[Double]) = - Iterator.fromArray(xs) foreach { x => Console.println(x) }; - - def findGreater(xs: Array[Double], limit: Double) = - Iterator.fromArray(xs) - .zip(Iterator.from(0)) - .filter{case Pair(x, i) => x > limit } - .map{case Pair(x, i) => i} - - def main(args: Array[String]) = { - val ar = Array/*[Double]*/(6, 2, 8, 5, 1); - printArray(ar); - Console.println("Elements greater than 3.0:"); - findGreater(ar, 3.0) foreach { x => Console.println(ar(x)) } - } - -} - diff --git a/sources/examples/jolib/Ref.scala b/sources/examples/jolib/Ref.scala deleted file mode 100644 index 73cc167307..0000000000 --- a/sources/examples/jolib/Ref.scala +++ /dev/null @@ -1,56 +0,0 @@ -/* __ *\ -** ________ ___ / / ___ Scala API ** -** / __/ __// _ | / / / _ | (c) 2003, LAMP/EPFL ** -** __\ \/ /__/ __ |/ /__/ __ | ** -** /____/\___/_/ |_/____/_/ | | ** -** |/ ** -** $Id$ -\* */ - -package examples.jolib; -/* -import concurrent.SyncVar; -import concurrent.jolib._; - -class Ref[a](init: a) extends Join { - - object get extends Synchr[a](this) { case class C() extends SyncVar[a]; } - object set extends Synchr[unit](this) { case class C(x: a) extends SyncVar[unit]; } - object state extends Asynchr(this) { case class C(x: a); } - - rules ( - Pair(List(get, state), { case List(g @ get.C(), state.C(x) ) => - { g.set(x); state(state.C(x)) } }), - Pair(List(set, state), { case List(s @ set.C(x), state.C(y) ) => - { s.set(()); state(state.C(x)) } }) - ); - - state(state.C(init)); - - def Get: a = get(get.C()); - def Set(x: a): unit = set(set.C(x)); -} -*/ -object RefTest { - - def main(args: Array[String]) = { - System.out.println("Started."); -/* - concurrent.ops.spawn({ - val r1 = new Ref(0); - System.out.println("Reference r1 created."); - System.out.println("Value r1 (first time) = " + r1.Get); - r1.Set(42); - System.out.println("Value r1 (second time) = " + r1.Get); - }); - concurrent.ops.spawn({ - val r2 = new Ref(100); - System.out.println("Reference r2 created."); - System.out.println("Value r2 (first time) = " + r2.Get); - r2.Set(89); - System.out.println("Value r2 (second time) = " + r2.Get); - }); -*/ - } - -} diff --git a/sources/examples/jolib/parallelOr.scala b/sources/examples/jolib/parallelOr.scala deleted file mode 100644 index bff4dcd87a..0000000000 --- a/sources/examples/jolib/parallelOr.scala +++ /dev/null @@ -1,59 +0,0 @@ -/* __ *\ -** ________ ___ / / ___ Scala API ** -** / __/ __// _ | / / / _ | (c) 2003, LAMP/EPFL ** -** __\ \/ /__/ __ |/ /__/ __ | ** -** /____/\___/_/ |_/____/_/ | | ** -** |/ ** -** $Id$ -\* */ - -package examples.jolib; -/* -import concurrent.jolib._; -import concurrent.SyncVar; - -/** Implementation in the join-calculus of a parallel OR. */ -object or extends Join { - - object res extends Synchr[boolean](this) { case class C() extends SyncVar[boolean] }; - object res1 extends Asynchr(this) { case class C(b: boolean); } - object res2 extends Asynchr(this) { case class C(b: boolean); } - object res1False extends Synchr[boolean](this) { case class C() extends SyncVar[boolean] }; - object res2False extends Synchr[boolean](this) { case class C() extends SyncVar[boolean] }; - - rules( - Pair(List(res, res1), { case List(r @ res.C(), res1.C(b)) => - if (b) r.set(b) else r.set(res1False(res1False.C())) }), - - Pair(List(res, res2), { case List(r @ res.C(), res2.C(b)) => - if (b) r.set(b) else r.set(res2False(res2False.C())) }), - - Pair(List(res1False, res2), { case List(r @ res1False.C(), res2.C(b)) => - r.set(b) }), - - Pair(List(res2False, res1), { case List(r @ res2False.C(), res1.C(b)) => - r.set(b) }) - ); - - def apply(b1: => boolean, b2: => boolean): boolean = { - concurrent.ops.spawn(res1(res1.C(b1))); - concurrent.ops.spawn(res2(res2.C(b2))); - res(res.C()) - } -} -*/ -object parallelOr { - - def main(args: Array[String]): unit = { - def loop: boolean = { while (true) {}; true }; -/* - System.out.println("true || true = " + or(true, true)); - System.out.println("false || false = " + or(false, false)); - System.out.println("false || true = " + or(false, true)); - System.out.println("true || false = " + or(true, false)); - System.out.println("true || loop = " + or(true, loop)); - System.out.println("loop || true = " + or(loop, true)); -*/ - } - -} diff --git a/sources/examples/maps.scala b/sources/examples/maps.scala deleted file mode 100644 index 87489d496d..0000000000 --- a/sources/examples/maps.scala +++ /dev/null @@ -1,192 +0,0 @@ -package examples; - -object maps { - - import scala.collection.immutable._; - - trait MapStruct[kt, vt] { - trait Map with Function1[kt, vt] { - def extend(key: kt, value: vt): Map; - def remove(key: kt): Map; - def domain: Stream[kt]; - def range: Stream[vt]; - } - type map <: Map; - val empty: map; - } - - class AlgBinTree[kt <: Ordered[kt], vt <: AnyRef]() extends MapStruct[kt, vt] { - type map = AlgMap; - - val empty: AlgMap = Empty(); - - private case class - Empty(), - Node(key: kt, value: vt, l: map, r: map) extends AlgMap {} - - trait AlgMap extends Map { - def apply(key: kt): vt = this match { - case Empty() => null - case Node(k, v, l, r) => - if (key < k) l.apply(key) - else if (key > k) r.apply(key) - else v - } - - def extend(key: kt, value: vt): map = this match { - case Empty()=> Node(key, value, empty, empty) - case Node(k, v, l, r) => - if (key < k) Node(k, v, l.extend(key, value), r) - else if (key > k) Node(k, v, l, r.extend(key, value)) - else Node(k, value, l, r) - } - - def remove(key: kt): map = this match { - case Empty()=> empty - case Node(k, v, l, r) => - if (key < k) Node(k, v, l.remove(key), r) - else if (key > k) Node(k, v, l, r.remove(key)) - else if (l == empty) r - else if (r == empty) l - else { - val midKey = r.domain.head; - Node(midKey, r.apply(midKey), l, r.remove(midKey)) - } - } - - def domain: Stream[kt] = this match { - case Empty()=> Stream.empty - case Node(k, v, l, r) => l.domain append Stream.cons(k, r.domain) - } - - def range: Stream[vt] = this match { - case Empty()=> Stream.empty - case Node(k, v, l, r) => l.range append Stream.cons(v, r.range) - } - } - } - - class OOBinTree[kt <: Ordered[kt], vt <: AnyRef]() extends MapStruct[kt, vt] { - type map = OOMap; - - trait OOMap extends Map { - def apply(key: kt): vt; - def extend(key: kt, value: vt): map; - def remove(key: kt): map; - def domain: Stream[kt]; - def range: Stream[vt]; - } - val empty: OOMap = new OOMap { - def apply(key: kt): vt = null; - def extend(key: kt, value: vt) = new Node(key, value, empty, empty); - def remove(key: kt) = empty; - def domain: Stream[kt] = Stream.empty; - def range: Stream[vt] = Stream.empty; - } - private class Node(k: kt, v: vt, l: map, r: map) extends OOMap { - def apply(key: kt): vt = - if (key < k) l.apply(key) - else if (key > k) r.apply(key) - else v; - def extend(key: kt, value: vt): map = - if (key < k) new Node(k, v, l.extend(key, value), r) - else if (key > k) new Node(k, v, l, r.extend(key, value)) - else new Node(k, value, l, r); - def remove(key: kt): map = - if (key < k) new Node(k, v, l.remove(key), r) - else if (key > k) new Node(k, v, l, r.remove(key)) - else if (l == empty) r - else if (r == empty) l - else { - val midKey = r.domain.head; - new Node(midKey, r(midKey), l, r.remove(midKey)) - } - def domain: Stream[kt] = l.domain append Stream.cons(k, r.domain); - def range: Stream[vt] = l.range append Stream.cons(v, r.range); - } - } - - class MutBinTree[kt <: Ordered[kt], vt <: AnyRef]() extends MapStruct[kt, vt] { - type map = MutMap; - class MutMap(key: kt, value: vt) extends Map { - val k = key; - var v = value; - var l, r = empty; - - def apply(key: kt): vt = - if (this == empty) null - else if (key < k) l.apply(key) - else if (key > k) r.apply(key) - else v; - - def extend(key: kt, value: vt): map = - if (this == empty) new MutMap(key, value) - else { - if (key < k) l = l.extend(key, value) - else if (key > k) r = r.extend(key, value) - else v = value; - this - } - - def remove(key: kt): map = - if (this == empty) this - else if (key < k) { l = l.remove(key) ; this } - else if (key > k) { r = r.remove(key) ; this } - else if (l == empty) r - else if (r == empty) l - else { - var mid = r; - while (!(mid.l == empty)) { mid = mid.l } - mid.r = r.remove(mid.k); - mid.l = l; - mid - } - - def domain: Stream[kt] = - if (this == empty) Stream.empty; - else l.domain append Stream.cons(k, r.domain); - - def range: Stream[vt] = - if (this == empty) Stream.empty; - else l.range append Stream.cons(v, r.range); - } - val empty = new MutMap(null, null); - } - - class Date(y: Int, m: Int, d: Int) with Ordered[Date] { - def year = y; - def month = m; - def day = d; - - def compareTo[b >: Date <% Ordered[b]](that: b): int = that match { - case other: Date => - if ((year == other.year) && - (month == other.month) && - (day == other.day)) - 0 - else if ((year < other.year) || - (year == other.year && month < other.month) || - (month == other.month && day < other.day)) - -1 - else - 1 - case _ => - -(that compareTo this) - } - - override def equals(that: Any): Boolean = - that.isInstanceOf[Date] && { - val o = that.asInstanceOf[Date]; - day == o.day && month == o.month && year == o.year - } - } - - def main(args: Array[String]) = { - val t = new OOBinTree[Date, String](); - () - } - -} - - - diff --git a/sources/examples/mobile/sort.scala b/sources/examples/mobile/sort.scala deleted file mode 100644 index 62818467fa..0000000000 --- a/sources/examples/mobile/sort.scala +++ /dev/null @@ -1,17 +0,0 @@ -package examples.mobile; - -import java.net._; -import scala.mobile._; - - -object sort with Application { - val url = new URL("http://scala.epfl.ch/classes/examples.jar"); - - val location = new Location(url); - val obj = location create "examples.sort"; - val ar = Array(6, 2, 8, 5, 1); - obj[Array[Int], Unit]("println")(ar); - obj[Array[Int], Unit]("sort")(ar); - obj[Array[Int], Unit]("println")(ar); - Console.println -} diff --git a/sources/examples/monads/callccInterpreter.scala b/sources/examples/monads/callccInterpreter.scala deleted file mode 100644 index 934fce1a9e..0000000000 --- a/sources/examples/monads/callccInterpreter.scala +++ /dev/null @@ -1,84 +0,0 @@ -object callccInterpreter { - - type Answer = Value; - - case class M[A](in: (A => Answer) => Answer) { - def bind[B](k: A => M[B]) = M[B](c => in (a => k(a) in c)); - def map[B](f: A => B): M[B] = bind(x => unitM(f(x))); - def flatMap[B](f: A => M[B]): M[B] = bind(f); - } - - def unitM[A](a: A) = M[A](c => c(a)); - - def showM(m: M[Value]): String = (m in id).toString(); - - def callCC[A](h: (A => M[A]) => M[A]) = - M[A](c => h(a => M[A](d => c(a))) in c); - - type Name = String; - - trait Term; - case class Var(x: Name) extends Term; - case class Con(n: int) extends Term; - case class Add(l: Term, r: Term) extends Term; - case class Lam(x: Name, body: Term) extends Term; - case class App(fun: Term, arg: Term) extends Term; - case class Ccc(x: Name, t: Term) extends Term; - - trait Value; - case object Wrong extends Value { - override def toString() = "wrong" - } - case class Num(n: int) extends Value { - override def toString() = n.toString(); - } - case class Fun(f: Value => M[Value]) extends Value { - override def toString() = "<function>" - } - - type Environment = List[Pair[Name, Value]]; - - def lookup(x: Name, e: Environment): M[Value] = e match { - case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) - } - - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) - case _ => unitM(Wrong) - } - - def apply(a: Value, b: Value): M[Value] = a match { - case Fun(k) => k(b) - case _ => unitM(Wrong) - } - - def interp(t: Term, e: Environment): M[Value] = t match { - case Var(x) => lookup(x, e) - case Con(n) => unitM(Num(n)) - case Add(l, r) => for (val a <- interp(l, e); - val b <- interp(r, e); - val c <- add(a, b)) - yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) - case App(f, t) => for (val a <- interp(f, e); - val b <- interp(t, e); - val c <- apply(a, b)) - yield c - case Ccc(x, t) => callCC(k => interp(t, Pair(x, Fun(k)) :: e)) - } - - def test(t: Term): String = - showM(interp(t, List())); - - val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - val term1 = App(Con(1), Con(2)); - val term2 = Add(Con(1), Ccc("k", Add(Con(2), App(Var("k"), Con(4))))); - - def main(args: Array[String]) = { - System.out.println(test(term0)); - System.out.println(test(term1)); - System.out.println(test(term2)); - } -} - diff --git a/sources/examples/monads/directInterpreter.scala b/sources/examples/monads/directInterpreter.scala deleted file mode 100644 index 0e2aae4a7b..0000000000 --- a/sources/examples/monads/directInterpreter.scala +++ /dev/null @@ -1,55 +0,0 @@ -object directInterpreter { - - type Name = String; - - trait Term; - case class Var(x: Name) extends Term; - case class Con(n: int) extends Term; - case class Add(l: Term, r: Term) extends Term; - case class Lam(x: Name, body: Term) extends Term; - case class App(fun: Term, arg: Term) extends Term; - - trait Value; - case object Wrong extends Value; - case class Num(n: int) extends Value; - case class Fun(f: Value => Value)extends Value; - - def showval(v: Value): String = v match { - case Wrong => "<wrong>" - case Num(n) => n.toString() - case Fun(f) => "<function>" - } - - type Environment = List[Pair[Name, Value]]; - - def lookup(x: Name, e: Environment): Value = e match { - case List() => Wrong - case Pair(y, b) :: e1 => if (x == y) b else lookup(x, e1) - } - - def add(a: Value, b: Value): Value = Pair(a, b) match { - case Pair(Num(m), Num(n)) => Num(m + n) - case _ => Wrong - } - - def apply(a: Value, b: Value) = a match { - case Fun(k) => k(b) - case _ => Wrong - } - - def interp(t: Term, e: Environment): Value = t match { - case Var(x) => lookup(x, e) - case Con(n) => Num(n) - case Add(l, r) => add(interp(l, e), interp(r, e)) - case Lam(x, t) => Fun(a => interp(t, Pair(x, a) :: e)) - case App(f, t) => apply(interp(f, e), interp(t, e)) - } - - def test(t: Term): String = - showval(interp(t, List())); - - val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - - def main(args: Array[String]) = - System.out.println(test(term0)); -} diff --git a/sources/examples/monads/errorInterpreter.scala b/sources/examples/monads/errorInterpreter.scala deleted file mode 100644 index 05dc979621..0000000000 --- a/sources/examples/monads/errorInterpreter.scala +++ /dev/null @@ -1,86 +0,0 @@ -object errorInterpreter { - - trait M[A] { - def show: String; - def bind[B](k: A => M[B]); - def map[B](f: A => B): M[B] = bind(x => unitM(f(x))); - def flatMap[B](f: A => M[B]): M[B] = bind(f); - } - - def unitM[A](a: A): M[A] = new Suc(a); - def errorM[A](msg: String): M[A] = new Err(msg); - - def showM(m: M[Value]): String = m.show; - - class Suc[A](x: T) extends M[A] { - def bind[A](k: A => M[B]): M[B] = k(x); - def show: String = "Success: " + x; - } - class Err[T](msg: String) extends M[T] { - def bind[A](k: A => M[B]): M[B] = new Err(msg); - def show: String = "Error: " + msg; - } - - type Name = String; - - trait Term; - case class Var(x: Name) extends Term; - case class Con(n: int) extends Term; - case class Add(l: Term, r: Term) extends Term; - case class Lam(x: Name, body: Term) extends Term; - case class App(fun: Term, arg: Term) extends Term; - - trait Value; - case object Wrong extends Value { - override def toString() = "wrong" - } - case class Num(n: int) extends Value { - override def toString() = n.toString(); - } - case class Fun(f: Value => M[Value]) extends Value { - override def toString() = "<function>" - } - - type Environment = List[Pair[Name, Value]]; - - def lookup(x: Name, e: Environment): M[Value] = e match { - case List() => errorM("unbound variable: " + x); - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) - } - - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) - case _ => errorM("should be numbers: " + a + "," + b) - } - - def apply(a: Value, b: Value): M[Value] = a match { - case Fun(k) => k(b) - case _ => errorM("should be function: " + a); - } - - def interp(t: Term, e: Environment): M[Value] = t match { - case Var(x) => lookup(x, e) - case Con(n) => unitM(Num(n)) - case Add(l, r) => for (val a <- interp(l, e); - val b <- interp(r, e); - val c <- add(a, b)) - yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) - case App(f, t) => for (val a <- interp(f, e); - val b <- interp(t, e); - val c <- apply(a, b)) - yield c - } - - def test(t: Term): String = - showM(interp(t, List())); - - val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - val term1 = App(Con(1), Con(2)); - - def main(args: Array[String]) = { - System.out.println(test(term0)); - System.out.println(test(term1)); - } -} - diff --git a/sources/examples/monads/simpleInterpreter.scala b/sources/examples/monads/simpleInterpreter.scala deleted file mode 100644 index d728c620cf..0000000000 --- a/sources/examples/monads/simpleInterpreter.scala +++ /dev/null @@ -1,75 +0,0 @@ -object simpleInterpreter { - - case class M[A](value: A) { - def bind[B](k: A => M[B]): M[B] = k(value); - def map[B](f: A => B): M[B] = bind(x => unitM(f(x))); - def flatMap[B](f: A => M[B]): M[B] = bind(f); - } - - def unitM[A](a: A): M[A] = M(a); - - def showM(m: M[Value]): String = m.value.toString(); - - type Name = String; - - trait Term; - case class Var(x: Name) extends Term; - case class Con(n: int) extends Term; - case class Add(l: Term, r: Term) extends Term; - case class Lam(x: Name, body: Term) extends Term; - case class App(fun: Term, arg: Term) extends Term; - - trait Value; - case object Wrong extends Value { - override def toString() = "wrong" - } - case class Num(n: int) extends Value { - override def toString() = n.toString(); - } - case class Fun(f: Value => M[Value]) extends Value { - override def toString() = "<function>" - } - - type Environment = List[Pair[Name, Value]]; - - def lookup(x: Name, e: Environment): M[Value] = e match { - case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) - } - - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => unitM(Num(m + n)) - case _ => unitM(Wrong) - } - - def apply(a: Value, b: Value): M[Value] = a match { - case Fun(k) => k(b) - case _ => unitM(Wrong) - } - - def interp(t: Term, e: Environment): M[Value] = t match { - case Var(x) => lookup(x, e) - case Con(n) => unitM(Num(n)) - case Add(l, r) => for (val a <- interp(l, e); - val b <- interp(r, e); - val c <- add(a, b)) - yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) - case App(f, t) => for (val a <- interp(f, e); - val b <- interp(t, e); - val c <- apply(a, b)) - yield c - } - - def test(t: Term): String = - showM(interp(t, List())); - - val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - val term1 = App(Con(1), Con(2)); - - def main(args: Array[String]) = { - System.out.println(test(term0)); - System.out.println(test(term1)); - } -} - diff --git a/sources/examples/monads/stateInterpreter.scala b/sources/examples/monads/stateInterpreter.scala deleted file mode 100644 index 593f2d9e3e..0000000000 --- a/sources/examples/monads/stateInterpreter.scala +++ /dev/null @@ -1,86 +0,0 @@ -package examples.monads; - -object stateInterpreter { - - type State = int; - - val tickS = new M(s => Pair((), s + 1)); - - case class M[A](in: State => Pair[A, State]) { - def bind[B](k: A => M[B]) = M[B]{ s0 => - val Pair(a, s1) = this in s0; k(a) in s1 - } - def map[B](f: A => B): M[B] = bind(x => unitM(f(x))); - def flatMap[B](f: A => M[B]): M[B] = bind(f); - } - - def unitM[A](a: A) = M[A](s => Pair(a, s)); - - def showM(m: M[Value]): String = { - val Pair(a, s1) = m in 0; - "Value: " + a + "; Count: " + s1 - } - - type Name = String; - - trait Term; - case class Var(x: Name) extends Term; - case class Con(n: int) extends Term; - case class Add(l: Term, r: Term) extends Term; - case class Lam(x: Name, body: Term) extends Term; - case class App(fun: Term, arg: Term) extends Term; - - trait Value; - case object Wrong extends Value { - override def toString() = "wrong" - } - case class Num(n: int) extends Value { - override def toString() = n.toString(); - } - case class Fun(f: Value => M[Value]) extends Value { - override def toString() = "<function>" - } - - type Environment = List[Pair[Name, Value]]; - - def lookup(x: Name, e: Environment): M[Value] = e match { - case List() => unitM(Wrong) - case Pair(y, b) :: e1 => if (x == y) unitM(b) else lookup(x, e1) - } - - def add(a: Value, b: Value): M[Value] = Pair(a, b) match { - case Pair(Num(m), Num(n)) => for (val _ <- tickS) yield Num(m + n) - case _ => unitM(Wrong) - } - - def apply(a: Value, b: Value): M[Value] = a match { - case Fun(k) => for (val _ <- tickS; val c <- k(b)) yield c - case _ => unitM(Wrong) - } - - def interp(t: Term, e: Environment): M[Value] = t match { - case Var(x) => lookup(x, e) - case Con(n) => unitM(Num(n)) - case Add(l, r) => for (val a <- interp(l, e); - val b <- interp(r, e); - val c <- add(a, b)) - yield c - case Lam(x, t) => unitM(Fun(a => interp(t, Pair(x, a) :: e))) - case App(f, t) => for (val a <- interp(f, e); - val b <- interp(t, e); - val c <- apply(a, b)) - yield c - } - - def test(t: Term): String = - showM(interp(t, List())); - - val term0 = App(Lam("x", Add(Var("x"), Var("x"))), Add(Con(10), Con(11))); - val term1 = App(Con(1), Con(2)); - - def main(args: Array[String]) = { - System.out.println(test(term0)); - System.out.println(test(term1)); - } -} - diff --git a/sources/examples/oneplacebuffer.scala b/sources/examples/oneplacebuffer.scala deleted file mode 100644 index 7fa2ae8dba..0000000000 --- a/sources/examples/oneplacebuffer.scala +++ /dev/null @@ -1,47 +0,0 @@ -package examples; - -object oneplacebuffer { - - import scala.concurrent._; - - class OnePlaceBuffer { - private val m = new MailBox() {}; // An internal mailbox - private case class Empty(), Full(x: Int); // Types of messages we deal with - - m send Empty(); // Initialization - - def write(x: Int): Unit = m receive { - case Empty() => - Console.println("put " + x); - m send Full(x) - } - - def read: Int = m receive { - case Full(x) => - Console.println("get " + x); - m send Empty() ; x - } - } - - def main(args: Array[String]) = { - val buf = new OnePlaceBuffer; - val random = new java.util.Random(); - - def producer(n: int): unit = { - Thread.sleep(random.nextInt(1000)); - buf.write(n); - producer(n + 1) - } - - def consumer: unit = { - Thread.sleep(random.nextInt(1000)); - val n = buf.read; - consumer - } - - ops.spawn(producer(0)); - ops.spawn(consumer) - } - -} - diff --git a/sources/examples/parsers1.scala b/sources/examples/parsers1.scala deleted file mode 100644 index 143f354049..0000000000 --- a/sources/examples/parsers1.scala +++ /dev/null @@ -1,118 +0,0 @@ -package examples; - -object parsers1 { - - abstract class Parsers { - - type inputType; - - abstract class Parser { - - type Result = Option[inputType]; - - def apply(in: inputType): Result; - - /*** p &&& q applies first p, and if that succeeds, then q - */ - def &&& (q: => Parser) = new Parser { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => None - case Some(in1) => q(in1) - } - } - - /*** p ||| q applies first p, and, if that fails, then q. - */ - def ||| (q: => Parser) = new Parser { - def apply(in: inputType): Result = Parser.this.apply(in) match { - case None => q(in) - case s => s - } - } - } - - val empty = new Parser { - def apply(in: inputType): Result = Some(in) - } - - val fail = new Parser { - def apply(in: inputType): Result = None - } - - def opt(p: Parser): Parser = p ||| empty; // p? = (p | <empty>) - def rep(p: Parser): Parser = opt(rep1(p)); // p* = [p+] - def rep1(p: Parser): Parser = p &&& rep(p); // p+ = p p* - } - - abstract class ListParsers extends Parsers { - def chr(p: char => boolean): Parser; - def chr(c: char): Parser = chr(d: char => d == c); - - def letter : Parser = chr(Character.isLetter); - def digit : Parser = chr(Character.isDigit); - - def ident : Parser = letter &&& rep(letter ||| digit); - def number : Parser = digit &&& rep(digit); - def list : Parser = chr('(') &&& listElems &&& chr(')'); - def listElems : Parser = expr &&& (chr(',') &&& listElems ||| empty); - def expr : Parser = ident ||| number ||| list; - } - - abstract class ExprParsers extends Parsers { - def chr(p: char => boolean): Parser; - def chr(c: char): Parser = chr(d: char => d == c); - - def digit : Parser = chr(Character.isDigit); - def number : Parser = digit &&& rep(digit); - def summand : Parser = number ||| chr('(') &&& expr &&& chr(')'); - def expr : Parser = summand &&& rep(chr('+') &&& summand) - } - - class ParseString(s: String) extends Parsers { - type inputType = int; - val input = 0; - def chr(p: char => boolean) = new Parser { - def apply(in: int): Parser#Result = - if (in < s.length() && p(s charAt in)) Some(in + 1); - else None; - } - } - - object TestList { - - def main(args: Array[String]): unit = - if (args.length == 1) { - val ps = new ListParsers with ParseString(args(0)); - ps.expr(ps.input) match { - case Some(n) => - Console.println("parsed: " + args(0).substring(0, n)); - case None => - Console.println("nothing parsed"); - } - } - else - Console.println("usage: java examples.TestList <expr-string>"); - } - - object TestExpr { - - def main(args: Array[String]): unit = - if (args.length == 1) { - val ps = new ExprParsers with ParseString(args(0)); - ps.expr(ps.input) match { - case Some(n) => - Console.println("parsed: " + args(0).substring(0, n)); - case None => - Console.println("nothing parsed"); - } - } - else - Console.println("usage: java examples.TestExpr <expr-string>"); - } - - def main(args: Array[String]): Unit = { - TestList.main(Array("(a,b,(1,2))")); - TestExpr.main(Array("2+3+(4+1)")) - } - -} diff --git a/sources/examples/parsers2.scala b/sources/examples/parsers2.scala deleted file mode 100644 index 47fa8d0f2e..0000000000 --- a/sources/examples/parsers2.scala +++ /dev/null @@ -1,63 +0,0 @@ -package examples; - -object parsers2 { - - abstract class Tree{} - case class Id (s: String) extends Tree {} - case class Num(n: int) extends Tree {} - case class Lst(elems: List[Tree]) extends Tree {} - - abstract class ListParsers extends CharParsers { - - def ident: Parser[Tree] = - for ( - val c: char <- chr(Character.isLetter); - val cs: List[char] <- rep(chr(Character.isLetterOrDigit)) - ) yield Id((c :: cs).mkString("", "", "")); - - def number: Parser[Tree] = - for ( - val d: char <- chr(Character.isDigit); - val ds: List[char] <- rep(chr(Character.isDigit)) - ) yield Num(((d - '0') /: ds) ((x, digit) => x * 10 + digit - '0')); - - def list: Parser[Tree] = - for ( - val _ <- chr('('); - val es <- listElems ||| succeed(List()); - val _ <- chr(')') - ) yield Lst(es); - - def listElems: Parser[List[Tree]] = - for ( - val x <- expr; - val xs <- chr(',') &&& listElems ||| succeed(List()) - ) yield x :: xs; - - def expr: Parser[Tree] = - list ||| ident ||| number; - - } - - class ParseString(s: String) extends Parsers { - type inputType = int; - val input = 0; - def any = new Parser[char] { - def apply(in: int): Parser[char]#Result = - if (in < s.length()) Some(Pair(s charAt in, in + 1)) else None; - } - } - - def main(args: Array[String]): unit = - Console.println( - if (args.length == 1) { - val ps = new ListParsers with ParseString(args(0)); - ps.expr(ps.input) match { - case Some(Pair(list, _)) => Console.println("parsed: " + list); - case None => "nothing parsed" - } - } else "usage: scala examples.parsers2 <expr-string>" - ); - -} - diff --git a/sources/examples/patterns.scala b/sources/examples/patterns.scala deleted file mode 100644 index 34b0db96ae..0000000000 --- a/sources/examples/patterns.scala +++ /dev/null @@ -1,35 +0,0 @@ -package examples; - -object patterns { - - trait Tree; - case class Branch(left: Tree, right: Tree) extends Tree; - case class Leaf(x: Int) extends Tree; - - val tree1 = Branch(Branch(Leaf(1), Leaf(2)), Branch(Leaf(3), Leaf(4))); - - def sumLeaves(t: Tree): Int = t match { - case Branch(l, r) => sumLeaves(l) + sumLeaves(r) - case Leaf(x) => x - } - - def find[a,b](it: Iterator[Pair[a, b]], x: a): Option[b] = { - var result: Option[b] = _; - while (it.hasNext && result == null) { - val Pair(x1, y) = it.next; - if (x == x1) result = Some(y) - } - if (result == null) None else result - } - - def printFinds[a](xs: List[Pair[a, String]], x: a) = - find(xs.elements, x) match { - case Some(y) => System.out.println(y) - case None => System.out.println("no match") - } - - def main(args: Array[String]): Unit = { - Console.println("sum of leafs=" + sumLeaves(tree1)); - printFinds(List(Pair(3, "three"), Pair(4, "four")), 4) - } -}
\ No newline at end of file diff --git a/sources/examples/pilib/elasticBuffer.scala b/sources/examples/pilib/elasticBuffer.scala deleted file mode 100644 index 5e52a0fdce..0000000000 --- a/sources/examples/pilib/elasticBuffer.scala +++ /dev/null @@ -1,77 +0,0 @@ -package examples.pilib; - -object elasticBuffer { - - import scala.concurrent.pilib._; - - /** - * Recursive type for channels that carry a "String" channel and - * an object of the type we define. - */ - class MetaChan extends Chan[Pair[Chan[String], MetaChan]]; - - def Buffer(put: Chan[String], get: Chan[String]): unit = { - - /** - * An empty buffer cell, ready to pass on (o,r) to the left. - */ - def Bl(i:Chan[String], l: MetaChan, - o: Chan[String], r: MetaChan): unit = - choice ( - l(Pair(o,r)) * (System.out.println("Removed one cell.")), - i * (inp => Cl(i, l, o, r, inp)) - ); - - /** - * A buffer cell containing a value, ready to receive (o,r) from the right. - */ - def Cl(i: Chan[String], l: MetaChan, - o: Chan[String], r: MetaChan, content: String): unit = - choice ( - o(content) * (Bl(i,l,o,r)), - i * (inp => Dl(i,l,o,r,content, inp)), - r * ( { case Pair(newo, newr) => Cl(i,l,newo,newr,content) }) - ); - - /** - * Two joined buffer cells, of type Cl. - */ - def Dl(i: Chan[String], l: MetaChan, - o: Chan[String], r: MetaChan, - content: String, inp: String): unit = { - val newlr = new MetaChan; - val newio = new Chan[String]; - spawn < Cl(i, l, newio, newlr, inp) | Cl(newio, newlr, o, r,content) >; - } - - // l and r channels for the leftmost and rightmost cell, respectively. - val unused1 = new MetaChan; - val unused2 = new MetaChan; - - Bl(put, unused1, get, unused2); - } - - val random = new java.util.Random(); - - def Producer(n: int, put: Chan[String]): unit = { - Thread.sleep(1 + random.nextInt(1000)); - val msg = "object " + n; - put.write(msg); - System.out.println("Producer gave " + msg); - Producer(n + 1, put) - } - - def Consumer(get: Chan[String]): unit = { - Thread.sleep(1 + random.nextInt(1000)); - val msg = get.read; - System.out.println("Consummer took " + msg); - Consumer(get) - } - - def main(args: Array[String]): unit = { - val put = new Chan[String]; - val get = new Chan[String]; - spawn < Producer(0, put) | Consumer(get) | Buffer(put, get) > - } - -} diff --git a/sources/examples/pilib/handover.scala b/sources/examples/pilib/handover.scala deleted file mode 100644 index 85fb899555..0000000000 --- a/sources/examples/pilib/handover.scala +++ /dev/null @@ -1,190 +0,0 @@ -package examples.pilib; - -/** -* Handover example with recursive types for channels. -*/ -object handoverRecursive { - - import concurrent.pilib._; - - val random = new java.util.Random(); - - /** - * Recursive type for channels that carry a channel "unit" and - * an object of the type we define. - */ - class Switch extends Chan[Pair[Chan[unit], Switch]]; - - /** - * Car. - */ - def Car(talk: Chan[unit], switch: Switch): unit = - choice ( - switch * ({ case Pair(t,s) => Car(t, s) }), - talk(()) * ( { - Thread.sleep(1 + random.nextInt(1000)); - System.out.println("Car emitted a message."); - Car(talk, switch) - }) - ); - - /** - * Control center. - */ - def Control(talk1: Chan[unit], switch1: Switch, - gain1: Switch, lose1: Switch, - talk2: Chan[unit], switch2: Switch, - gain2: Switch, lose2: Switch): unit - = { - def Control1: unit= { - Thread.sleep(1 + random.nextInt(1000)); - lose1.write(Pair(talk2, switch2)); - gain2.write(Pair(talk2, switch2)); - Control2; - } - def Control2: unit = { - Thread.sleep(1 + random.nextInt(1000)); - lose2.write(Pair(talk1, switch1)); - gain1.write(Pair(talk1, switch1)); - Control1; - } - Control1; - } - - /** - * Active transmitter. - */ - def ActiveTransmitter(id: String, talk: Chan[unit], switch: Switch, - gain: Switch, lose: Switch): unit - = - choice ( - talk * (x => { - System.out.println(id + " received a message."); - ActiveTransmitter(id, talk, switch, gain, lose) - }), - lose * ({ case Pair(t, s) => { - switch.write(Pair(t, s)); - IdleTransmitter(id, gain, lose) - }}) - ); - - /** - * Idle transmitter. - */ - def IdleTransmitter(id: String, gain: Switch, lose: Switch): unit = { - val Pair(t, s) = gain.read; - ActiveTransmitter(id, t, s, gain, lose) - } - - def main(args: Array[String]): unit = { - val talk1 = new Chan[unit]; - val switch1 = new Switch; - val gain1 = new Switch; - val lose1 = new Switch; - val talk2 = new Chan[unit]; - val switch2 = new Switch; - val gain2 = new Switch; - val lose2 = new Switch; - spawn < - Car(talk1, switch1) | - ActiveTransmitter("Transmitter 1", talk1, switch1, gain1, lose1) | - IdleTransmitter("Transmitter 2", gain2, lose2) | - Control(talk1, switch1, gain1, lose1, talk2, switch2, gain2, lose2) - > - } -} - -/** -* Handover example with type casts. -*/ -object handoverCast { - - import concurrent.pilib._; - - val random = new java.util.Random(); - - /** - * Car. - */ - def Car(talk: Chan[Any], switch: Chan[Any]): unit = - choice ( - switch * (o => { - val Pair(t,s) = o.asInstanceOf[Pair[Chan[Any],Chan[Any]]]; - Car(t, s) - }), - talk(()) * ( { - Thread.sleep(1 + random.nextInt(1000)); - System.out.println("Car emitted a message."); - Car(talk, switch) - }) - ); - - /** - * Control center. - */ - def Control(talk1: Chan[Any], switch1: Chan[Any], - gain1: Chan[Any], lose1: Chan[Any], - talk2: Chan[Any], switch2: Chan[Any], - gain2: Chan[Any], lose2: Chan[Any]): unit - = { - def Control1: unit= { - Thread.sleep(1 + random.nextInt(1000)); - lose1.write(Pair(talk2, switch2)); - gain2.write(Pair(talk2, switch2)); - Control2 - } - def Control2: unit = { - Thread.sleep(1 + random.nextInt(1000)); - lose2.write(Pair(talk1, switch1)); - gain1.write(Pair(talk1, switch1)); - Control1 - } - Control1 - } - - /** - * Active transmitter. - */ - def ActiveTransmitter(id: String, talk: Chan[Any], switch: Chan[Any], - gain: Chan[Any], lose: Chan[Any]): unit - = - choice ( - talk * (x => { - System.out.println(id + " received a message."); - ActiveTransmitter(id, talk, switch, gain, lose) - }), - lose * (o => { - val Pair(t, s) = o.asInstanceOf[Pair[Chan[Any],Chan[Any]]]; - switch.write(Pair(t, s)); - IdleTransmitter(id, gain, lose) - }) - ); - - /** - * Idle transmitter. - */ - def IdleTransmitter(id: String, gain: Chan[Any], lose: Chan[Any]): unit = { - val Pair(t, s) = gain.read.asInstanceOf[Pair[Chan[Any],Chan[Any]]]; - ActiveTransmitter(id, t, s, gain, lose) - } - - def main(args: Array[String]): unit = { - val talk1 = new Chan[Any]; - val switch1 = new Chan[Any]; - val gain1 = new Chan[Any]; - val lose1 = new Chan[Any]; - val talk2 = new Chan[Any]; - val switch2 = new Chan[Any]; - val gain2 = new Chan[Any]; - val lose2 = new Chan[Any]; - spawn < - Car(talk1, switch1) | - ActiveTransmitter("Transmitter 1", talk1, switch1, gain1, lose1) | - IdleTransmitter("Transmitter 2", gain2, lose2) | - Control(talk1, switch1, gain1, lose1, talk2, switch2, gain2, lose2) - > - } - -} - - diff --git a/sources/examples/pilib/mobilePhoneProtocol.scala b/sources/examples/pilib/mobilePhoneProtocol.scala deleted file mode 100644 index 0b13f78fd3..0000000000 --- a/sources/examples/pilib/mobilePhoneProtocol.scala +++ /dev/null @@ -1,172 +0,0 @@ -package examples.pilib; - -/** -* Mobile phone protocol. -* Equivalent to a three-place buffer. -* @see Bjoern Victor "A verification tool for the polyadic pi-calculus". -*/ -object mobilePhoneProtocol { - - import concurrent.pilib._; - - val random = new java.util.Random(); - - // Internal messages exchanged by the protocol. - trait Message; - - // Predefined messages used by the protocol. - case class Data() extends Message; - case class HoCmd() extends Message; // handover command - case class HoAcc() extends Message; // handover access - case class HoCom() extends Message; // handover complete - case class HoFail() extends Message; // handover fail - case class ChRel() extends Message; // release - case class Voice(s: String) extends Message; // voice - case class Channel(n: Chan[Message]) extends Message; // channel - - def MobileSystem(in: Chan[String], out: Chan[String]): unit = { - - def CC(fa: Chan[Message], fp: Chan[Message], l: Chan[Channel]): unit = - choice ( - in * (v => { fa.write(Data()); fa.write(Voice(v)); CC(fa, fp, l) }) - , - l * (m_new => { - fa.write(HoCmd()); - fa.write(m_new); - choice ( - fp * ({ case HoCom() => { - System.out.println("Mobile has moved from one cell to another"); - fa.write(ChRel()); - val Channel(m_old) = fa.read; - l.write(Channel(m_old)); - CC(fp, fa, l) - }}) - , - fa * ({ case HoFail() => { - System.out.println("Mobile has failed to move from one cell to another"); - l.write(m_new); - CC(fa, fp, l) - }}) - ) - }) - ); - - /* - * Continuously orders the MSC to switch the MS to the non-used BS. - */ - def HC(l: Chan[Channel], m: Chan[Message]): unit = { - Thread.sleep(1 + random.nextInt(1000)); - l.write(Channel(m)); - val Channel(m_new) = l.read; - HC(l, m_new) - } - - /** - * Mobile switching center. - */ - def MSC(fa: Chan[Message], fp: Chan[Message], m: Chan[Message]): unit = { - val l = new Chan[Channel]; - spawn < HC(l, m) | CC(fa, fp, l) > - } - - /** - * Active base station. - */ - def BSa(f: Chan[Message], m: Chan[Message]): unit = - (f.read) match { - case Data() => { - val v = f.read; - m.write(Data()); - m.write(v); - BSa(f, m) - } - case HoCmd() => { - val v = f.read; - m.write(HoCmd()); - m.write(v); - choice ( - f * ({ case ChRel() => { - f.write(Channel(m)); - BSp(f, m) - }}) - , - m * ({ case HoFail() => { - f.write(HoFail()); - BSa(f, m) - }}) - ) - } - }; - - /** - * Passive base station. - */ - def BSp(f: Chan[Message], m: Chan[Message]): unit = { - val HoAcc = m.read; - f.write(HoCom()); - BSa(f, m) - }; - - /** - * Mobile station. - */ - def MS(m: Chan[Message]): unit = - (m.read) match { - case Data() => { - val Voice(v) = m.read; - out.write(v); - MS(m) - } - case HoCmd() => - (m.read) match { - case Channel(m_new) => { - if (random.nextInt(1) == 0) - choice ( m_new(HoAcc()) * (MS(m_new)) ); - else - choice ( m(HoFail()) * (MS(m)) ); - } - } - }; - - def P(fa: Chan[Message], fp: Chan[Message]): unit = { - val m = new Chan[Message]; - spawn < MSC(fa, fp, m) | BSp(fp, m) > - } - - def Q(fa: Chan[Message]): unit = { - val m = new Chan[Message]; - spawn < BSa(fa, m) | MS(m) > - } - - val fa = new Chan[Message]; - val fp = new Chan[Message]; - spawn < Q(fa) | P(fa, fp) >; - } - - //***************** Entry function ******************// - - def main(args: Array[String]): unit = { - - def Producer(n: Int, put: Chan[String]): unit = { - Thread.sleep(1 + random.nextInt(1000)); - val msg = "object " + n; - put.write(msg); - System.out.println("Producer gave " + msg); - Producer(n + 1, put) - } - - def Consumer(get: Chan[String]): unit = { - Thread.sleep(1 + random.nextInt(1000)); - val msg = get.read; - System.out.println("Consummer took " + msg); - Consumer(get) - } - - val put = new Chan[String]; - val get = new Chan[String]; - spawn < Producer(0, put) | Consumer(get) | MobileSystem(put, get) > - } - -} - - diff --git a/sources/examples/pilib/piNat.scala b/sources/examples/pilib/piNat.scala deleted file mode 100644 index 137c0e5e6a..0000000000 --- a/sources/examples/pilib/piNat.scala +++ /dev/null @@ -1,92 +0,0 @@ -package examples.pilib; - -import scala.concurrent.pilib._; -//import pilib._; - -/** Church encoding of naturals in the Pi-calculus */ -object piNat with Application { - - /** Locations of Pi-calculus natural */ - class NatChan extends Chan[Triple[Chan[unit], Chan[NatChan], Chan[NatChan]]]; - - /** Zero */ - def Z(l: NatChan): unit = choice ( - l * { case Triple(z, sd, d) => z.write(()) } - ); - - /** Successor of Double */ - def SD(n: NatChan, l: NatChan): unit = choice ( - l * { case Triple(z, sd, d) => sd.write(n) } - ); - - /** Double */ - def D(n: NatChan, l: NatChan): unit = choice ( - l * { case Triple(z, sd, d) => d.write(n) } - ); - - /** Make "l" a location representing the natural "n" */ - def make(n: int, l: NatChan): unit = - if (n == 0) Z(l) - else if (n % 2 == 0) { val l1 = new NatChan; spawn < D(l1, l) >; make(n/2, l1) } - else { val l1 = new NatChan; spawn < SD(l1, l) >; make(n/2, l1) }; - - /** Consume the natural "m" and put it successor at location "n" */ - def Succ(m: NatChan, n: NatChan): unit = { - val z = new Chan[unit]; - val sd = new Chan[NatChan]; - val d = new Chan[NatChan]; - spawn < m.write(Triple(z, sd, d)) >; - choice ( - z * { x => make(1, n) }, - sd * { m1 => { val n1 = new NatChan; spawn < D(n1, n) >; Succ(m1, n1) } }, - d * { m1 => SD(m1, n) } - ) - } - - /** Consume the natural "l" and put two copies at locations "m" and "n" */ - def Copy(l: NatChan, m: NatChan, n: NatChan): unit = { - val z = new Chan[unit]; - val sd = new Chan[NatChan]; - val d = new Chan[NatChan]; - spawn < l.write(Triple(z, sd, d)) >; - choice ( - z * { x => spawn < Z(m) >; Z(n) }, - sd * { l1 => { val m1 = new NatChan; val n1 = new NatChan; - spawn < SD(m1, m) | SD(n1, n) >; - Copy(l1, m1, n1) } }, - d * { l1 => { val m1 = new NatChan; val n1 = new NatChan; - spawn < D(m1, m) | D(n1, n) >; - Copy(l1, m1, n1) } } - ) - } - - /** Consume the natural at location "n" and return its value */ - def value(n: NatChan): int = { - val z = new Chan[unit]; - val sd = new Chan[NatChan]; - val d = new Chan[NatChan]; - spawn < n.write(Triple(z, sd, d)) >; - choice ( - z * { x => 0 }, - sd * { n1 => 2 * value(n1) + 1 }, - d * { n1 => 2 * value(n1) } - ) - } - - // Test - val i = 42; - val l = new NatChan; - val l1 = new NatChan; - val l2 = new NatChan; - val l3 = new NatChan; - - spawn < - make(i, l) | - Copy(l, l1, l2) | - Succ(l2, l3) | - System.out.println("" + i + " = " + value(l1)) | - System.out.println("succ " + i + " = " + value(l3)) - >; - -} - diff --git a/sources/examples/pilib/rwlock.scala b/sources/examples/pilib/rwlock.scala deleted file mode 100644 index 0ed0f71a47..0000000000 --- a/sources/examples/pilib/rwlock.scala +++ /dev/null @@ -1,331 +0,0 @@ -package examples.pilib; - -/** -* From Pi to Scala: Semaphores, monitors, read/write locks. -* Readers/writers locks. -*/ -object rwlock { - - import scala.concurrent.pilib._; - - class Signal extends Chan[unit] { - def send = write(()); - def receive = read; - } - - class CountLock { - private val busy = new Signal; - def get = busy.send; - def release = busy.receive; - spawn < release > - } - - /** A binary semaphore - */ - class Lock { - private val busy = new Signal; - private val free = new Signal; - def get = busy.send; - def release = free.send; - spawn < (while (true) { - choice ( - busy * (x => free.receive), - free * (x => ()) - ) - }) - > - } - - /** A monitor a la Java - */ - class JavaMonitor { - - private val lock = new Lock; - - private var waiting: List[Signal] = Nil; - - def Wait = { - val s = new Signal; - waiting = s :: waiting; - lock.release; - s.receive; - lock.get; - } - - def Notify = { - if (!waiting.isEmpty) { - waiting.head.send; - waiting = waiting.tail; - } - } - - def NotifyAll = { - while (!waiting.isEmpty) { - waiting.head.send; - waiting = waiting.tail; - } - } - - def await(cond: => boolean): unit = while (false == cond) (Wait) - } - - /* - class Buffer[a](size: Int) extends JavaMonitor with { - var in = 0, out = 0, n = 0; - val elems = new Array[a](size); - def put(x: a) = synchronized { - await(n < size); - elems(out) = x; - out = (out + 1) % size; - } - def get: a = synchronized { - await(n > 0); - val x = elems(in); - in = (in + 1) % size; - x - } - } - */ - - /** A readers/writers lock. */ - trait ReadWriteLock { - def startRead: unit; - def startWrite: unit; - def endRead: unit; - def endWrite: unit; - } - - /** - * A readers/writers lock, using monitor abstractions. - */ - class ReadWriteLock1 extends JavaMonitor with ReadWriteLock { - - private var nactive: int = 0; - private var nwriters: int = 0; - - def status = - System.out.println(nactive + " active, " + nwriters + " writers"); - - def startRead = synchronized { - await(nwriters == 0); - nactive = nactive + 1; - status - } - - def startWrite = synchronized { - nwriters = nwriters + 1; - await(nactive == 0); - nactive = 1; - status - } - - def endRead = synchronized { - nactive = nactive - 1; - if (nactive == 0) NotifyAll; - status - } - - def endWrite = synchronized { - nwriters = nwriters - 1; - nactive = 0; - NotifyAll; - status - } - } - - /** A readers/writers lock, using semaphores - */ - class ReadWriteLock2 extends ReadWriteLock { - - private var rc: int = 0; // reading readers - private var wc: int = 0; // writing writers - private var rwc: int = 0; // waiting readers - private var wwc: int = 0; // waiting writers - private val mutex = new Lock; - private val rsem = new Lock; - private val wsem = new Lock; - - def startRead = { - mutex.get; - if (wwc > 0 || wc > 0) { - rwc = rwc + 1; - mutex.release; - rsem.get; - rwc = rwc - 1; - } - rc = rc + 1; - if (rwc > 0) rsem.release; - mutex.release - } - - def startWrite = { - mutex.get; - if (rc > 0 || wc > 0) { - wwc = wwc + 1; - mutex.release; - wsem.get; - wwc = wwc - 1; - } - wc = wc + 1; - mutex.release; - } - - def endRead = { - mutex.get; - rc = rc - 1; - if (rc == 0 && wwc > 0) wsem.release; - mutex.release - } - - def endWrite = { - mutex.get; - wc = wc - 1; - if (rwc > 0) - rsem.release - else if (wwc > 0) wsem.release; - mutex.release - } - } - - /** A readers/writers lock, using channels, without priortities - */ - class ReadWriteLock3 extends ReadWriteLock { - - private val sr = new Signal; - private val er = new Signal; - private val sw = new Signal; - private val ew = new Signal; - - def startRead = sr.send; - def startWrite = sw.send; - def endRead = er.send; - def endWrite = ew.send; - - private def rwlock: unit = choice ( - sr * (x => reading(1)), - sw * (x => { ew.receive; rwlock }) - ); - - private def reading(n: int): unit = choice ( - sr * (x => reading(n+1)), - er * (x => if (n == 1) rwlock else reading(n-1)) - ); - - spawn < rwlock >; - } - - /** Same, with sequencing - */ - class ReadWriteLock4 extends ReadWriteLock { - - private val rwlock = new ReadWriteLock3; - - private val sr = new Signal; - private val ww = new Signal; - private val sw = new Signal; - - def startRead = sr.send; - def startWrite = { ww.send; sw.send; } - def endRead = rwlock.endRead; - def endWrite = rwlock.endWrite; - - private def queue: unit = choice ( - sr * (x => { rwlock.startRead ; queue }), - ww * (x => { rwlock.startWrite; sw.receive; queue }) - ); - - spawn < queue >; - } - - /** Readwritelock where writers always have priority over readers - */ - class ReadWriteLock5 extends ReadWriteLock { - - private val sr = new Signal; - private val er = new Signal; - private val ww = new Signal; - private val sw = new Signal; - private val ew = new Signal; - - def startRead = sr.send; - def startWrite = { ww.send; sw.send; } - def endRead = er.send; - def endWrite = ew.send; - - private def Reading(nr: int, nw: int): unit = - if (nr == 0 && nw == 0) - choice ( - sr * (x => Reading(1, 0)), - ww * (x => Reading(0, 1)) - ) - else if (nr == 0 && nw != 0) { - sw.receive; - Writing(nw); - } - else if (nr != 0 && nw == 0) - choice ( - sr * (x => Reading(nr + 1, 0)), - er * (x => Reading(nr - 1, 0)), - ww * (x => Reading(nr, 1)) - ) - else if (nr != 0 && nw != 0) - choice ( - ww * (x => Reading(nr, nw + 1)), - er * (x => Reading(nr - 1, nw)) - ); - - private def Writing(nw: int): unit = choice ( - ew * (x => Reading(0, nw - 1)), - ww * (x => Writing(nw + 1)) - ); - - spawn < Reading(0, 0) >; - - } - - /** - * Main function. - */ - def main(args: Array[String]): unit = { - val random = new java.util.Random(); - - def reader(i: int, rwlock: ReadWriteLock): unit = { - Thread.sleep(1 + random.nextInt(100)); - System.err.println("Reader " + i + " wants to read."); - rwlock.startRead; - System.err.println("Reader " + i + " is reading."); - Thread.sleep(1 + random.nextInt(100)); - rwlock.endRead; - System.err.println("Reader " + i + " has read."); - reader(i, rwlock) - } - - def writer(i: int, rwlock: ReadWriteLock): unit = { - Thread.sleep(1 + random.nextInt(100)); - System.err.println("Writer " + i + " wants to write."); - rwlock.startWrite; - System.err.println("Writer " + i + " is writing."); - Thread.sleep(1 + random.nextInt(100)); - rwlock.endWrite; - System.err.println("Writer " + i + " has written."); - writer(i, rwlock) - } - - val n = try { Integer.parseInt(args(0)) } catch { case _ => 0 } - if (n < 1 || 5 < n) { - Console.println("Usage: scala examples.pilib.rwlock <n> (n=1..5)"); - exit - } - val rwlock = n match { - case 1 => new ReadWriteLock1 - case 2 => new ReadWriteLock2 - case 3 => new ReadWriteLock3 - case 4 => new ReadWriteLock4 - case 5 => new ReadWriteLock5 - } - List.range(0, 5) foreach (i => spawn < reader(i, rwlock) >); - List.range(0, 5) foreach (i => spawn < writer(i, rwlock) >); - } - -} - diff --git a/sources/examples/pilib/scheduler.scala b/sources/examples/pilib/scheduler.scala deleted file mode 100644 index 3b08a9df66..0000000000 --- a/sources/examples/pilib/scheduler.scala +++ /dev/null @@ -1,149 +0,0 @@ -package examples.pilib; - -import scala.concurrent.pilib._; - -object scheduler { - - /** - * Random number generator. - */ - val random = new java.util.Random(); - - //***************** Scheduler ******************// - - /** - * A cell of the scheduler whose attached agent is allowed to start. - */ - def A(a: Chan[unit], b: Chan[unit])(d: Chan[unit], c: Chan[unit]): unit = { - ///- ... complete here ... - choice ( a * { x => C(a, b)(d, c) }) - ///+ - } - - /** - * A cell of the scheduler in another intermediate state. - */ - def C(a: Chan[unit], b: Chan[unit])(d: Chan[unit], c: Chan[unit]): unit = { - ///- ... complete here ... - choice (c * { x => B(a, b)(d, c) }) - ///+ - } - - /** - * A cell of the scheduler whose attached agent is allowed to finish. - */ - def B(a: Chan[unit], b: Chan[unit])(d: Chan[unit], c: Chan[unit]): unit = { - ///- ... complete here ... - // choice (b * { x => D(a, b)(d, c) }) // incorrect naive solution - choice ( - b * { x => choice ( d(()) * A(a, b)(d, c) ) }, // b.'d.A - d(()) * (choice (b * { x => A(a, b)(d, c) })) // 'd.b.A - ) - ///+ - } - - /** - * A cell of the scheduler whose attached agent is not yet allowed to start. - */ - def D(a: Chan[unit], b: Chan[unit])(d: Chan[unit], c: Chan[unit]): unit = { - ///- ... complete here ... - choice (d(()) * A(a, b)(d, c)) - ///+ - } - - //***************** Agents ******************// - - def agent(i: Int)(a: Chan[unit], b: Chan[unit]): unit = { - // 50% chance that we sleep forever - if (i == 0 && random.nextInt(10) < 5) { - a.attach(x => System.out.println("Start and sleeps ----> " + i)); - Thread.sleep(random.nextInt(1000)); - a.write(()); - } - else { - a.attach(x => System.out.println("Start ----> " + i)); - b.attach(x => System.out.println("Stop -> " + i)); - Thread.sleep(random.nextInt(1000)); - a.write(()); - Thread.sleep(random.nextInt(1000)); - b.write(()); - agent(i)(a, b) - } - } - - //***************** Entry function ******************// - - /** - * Creates a scheduler for five agents (programs). - */ - - def main(args: Array[String]): unit = { - val agentNb = 5; - val agents = List.range(0, agentNb) map agent; - scheduleAgents(agents); - } - - //***************** Infrastructure *****************// - - /** - * A cell is modelled as a function that takes as parameters - * input and output channels and which returns nothing. - */ - type Cell = (Chan[unit], Chan[unit]) => unit; - - /** - * Creates a cell composed of two cells linked together. - */ - def join(cell1: Cell, cell2: Cell): Cell = - (l: Chan[unit], r: Chan[unit]) => { - val link = new Chan[unit]; - spawn < cell1(l, link) | cell2(link, r) > - }; - - /** - * Links the output of a cell to its input. - */ - def close(cell: Cell): unit = { - val a = new Chan[unit]; - cell(a, a) - } - - /** - * Creates a cell consisting of a chain of cells. - */ - def chain(cells: List[Cell]): Cell = - cells reduceLeft join; - - /** - * Creates a cell consisting of a chain of cells. - */ - def makeRing(cells: List[Cell]): unit = - close(chain(cells)); - - /** - * An agent is modelled as a function that takes as parameters channels to - * signal that it has started or finished. - */ - type Agent = (Chan[unit], Chan[unit]) => unit; - - /** - * Takes a list of agents and schedules them. - */ - def scheduleAgents(agents: List[Agent]): unit = { - var firstAgent = true; - val cells = agents map (ag => { - val a = new Chan[unit]; - val b = new Chan[unit]; - spawn < ag(a, b) >; - if (firstAgent) { - firstAgent = false; - A(a, b) - } - else - D(a, b) - }); - makeRing(cells) - } -} - - diff --git a/sources/examples/pilib/semaphore.scala b/sources/examples/pilib/semaphore.scala deleted file mode 100644 index cfb0c8e5a2..0000000000 --- a/sources/examples/pilib/semaphore.scala +++ /dev/null @@ -1,72 +0,0 @@ -package examples.pilib; - -/** Solution of exercise session 6 (first question). */ -object semaphore { - - import scala.concurrent.pilib._; - - class Signal extends Chan[unit] { - def send = write(()); - def receive = read; - } - - /** Interface. */ - trait Semaphore { - def get: unit; - def release: unit; - } - - /** First implementation. */ - class Sem1 extends Semaphore { - - private val g = new Signal; - private val r = new Signal; - - def get: unit = g.send; - def release: unit = r.send; - - private def Sched: unit = choice ( - g * (x => { r.receive; Sched }), - r * (x => Sched) - ); - spawn< Sched >; - } - - /** Second implementation. */ - class Sem2 extends Semaphore { - - private val a = new Signal; - private val na = new Signal; - - def get: unit = { a.receive; spawn< na.send > } - def release: unit = choice ( - a * (x => spawn< a.send >), - na * (x => spawn< a.send >) - ); - spawn< a.send >; - } - - /** Test program. */ - def main(args: Array[String]): unit = { - val random = new java.util.Random(); - val sem = new Sem2; - def mutex(p: => unit): unit = { sem.get; p; sem.release } - - spawn< { - Thread.sleep(1 + random.nextInt(100)); - mutex( { - System.out.println("a1"); - Thread.sleep(1 + random.nextInt(100)); - System.out.println("a2") - } ) - } | { - Thread.sleep(1 + random.nextInt(100)); - mutex( { - System.out.println("b1"); - Thread.sleep(1 + random.nextInt(100)); - System.out.println("b2") - } ) - } >; - } -} - diff --git a/sources/examples/pilib/twoPlaceBuffer.scala b/sources/examples/pilib/twoPlaceBuffer.scala deleted file mode 100644 index 686547b344..0000000000 --- a/sources/examples/pilib/twoPlaceBuffer.scala +++ /dev/null @@ -1,67 +0,0 @@ -package examples.pilib; - -import scala.concurrent.pilib._; - -/** Two-place buffer specification and implementation. */ -object twoPlaceBuffer with Application { - - /** - * Specification. - */ - def Spec[a](in: Chan[a], out: Chan[a]): unit = { - - def B0: unit = choice ( - in * (x => B1(x)) - ); - - def B1(x: a): unit = choice ( - out(x) * (B0), - in * (y => B2(x, y)) - ); - - def B2(x: a, y: a): unit = choice ( - out(x) * (B1(y)) - ); - - B0 - } - - /** - * Implementation using two one-place buffers. - */ - def Impl[a](in: Chan[a], out: Chan[a]): unit = { - ///- ... complete here ... - // one-place buffer - def OnePlaceBuffer[a](in: Chan[a], out: Chan[a]): unit = { - def B0: unit = choice ( in * (x => B1(x)) ); - def B1(x: a): unit = choice ( out(x) * (B0)); - B0 - } - val hidden = new Chan[a]; - spawn < OnePlaceBuffer(in, hidden) | OnePlaceBuffer(hidden, out) > - ///+ - } - - val random = new java.util.Random(); - - def Producer(n: Int, in: Chan[String]): unit = { - Thread.sleep(random.nextInt(1000)); - val msg = "" + n; - choice (in(msg) * {}); - Producer(n + 1, in) - } - - def Consumer(out: Chan[String]): unit = { - Thread.sleep(random.nextInt(1000)); - choice (out * { msg => () }); - Consumer(out) - } - - val in = new Chan[String]; - in.attach(s => System.out.println("put " + s)); - val out = new Chan[String]; - out.attach(s => System.out.println("get " + s)); - //spawn < Producer(0, in) | Consumer(out) | Spec(in, out) > - spawn < Producer(0, in) | Consumer(out) | Impl(in, out) > - -} diff --git a/sources/examples/sort.scala b/sources/examples/sort.scala deleted file mode 100644 index 6554a2415b..0000000000 --- a/sources/examples/sort.scala +++ /dev/null @@ -1,48 +0,0 @@ -package examples; - -object sort { - - def sort(a: Array[Int]): Unit = { - - def swap(i: Int, j: Int): Unit = { - val t = a(i); a(i) = a(j); a(j) = t; - } - - def sort1(l: Int, r: Int): Unit = { - val pivot = a((l + r) / 2); - var i = l; - var j = r; - while (i <= j) { - while (a(i) < pivot) { i = i + 1 } - while (a(j) > pivot) { j = j - 1 } - if (i <= j) { - swap(i, j); - i = i + 1; - j = j - 1; - } - } - if (l < j) sort1(l, j); - if (j < r) sort1(i, r); - } - - if (a.length > 0) - sort1(0, a.length - 1); - } - - def println(ar: Array[Int]) = { - def print1 = { - def iter(i: Int): String = - ar(i) + (if (i < ar.length-1) "," + iter(i+1) else ""); - if (ar.length == 0) "" else iter(0) - } - Console.println("[" + print1 + "]") - } - - def main(args: Array[String]) = { - val ar = Array(6, 2, 8, 5, 1); - println(ar); - sort(ar); - println(ar) - } - -} diff --git a/sources/examples/sort1.scala b/sources/examples/sort1.scala deleted file mode 100644 index 406bf7c911..0000000000 --- a/sources/examples/sort1.scala +++ /dev/null @@ -1,22 +0,0 @@ -package examples; - -object sort1 { - - def sort(a: List[Int]): List[Int] = { - if (a.length < 2) - a - else { - val pivot = a(a.length / 2); - sort(a.filter(x => x < pivot)) - ::: a.filter(x => x == pivot) - ::: sort(a.filter(x => x > pivot)) - } - } - - def main(args: Array[String]) = { - val xs = List(6, 2, 8, 5, 1); - Console.println(xs); - Console.println(sort(xs)) - } - -} diff --git a/sources/examples/sort2.scala b/sources/examples/sort2.scala deleted file mode 100644 index 53b2f89174..0000000000 --- a/sources/examples/sort2.scala +++ /dev/null @@ -1,25 +0,0 @@ -package examples; - -object sort2 { - - def sort(a: List[Int]): List[Int] = { - if (a.length < 2) - a - else { - val pivot = a(a.length / 2); - def lePivot(x: Int) = x < pivot; - def gtPivot(x: Int) = x > pivot; - def eqPivot(x: Int) = x == pivot; - sort(a filter lePivot) - ::: sort(a filter eqPivot) - ::: sort(a filter gtPivot) - } - } - - def main(args: Array[String]) = { - val xs = List(6, 2, 8, 5, 1); - Console.println(xs); - Console.println(sort(xs)) - } - -} diff --git a/sources/examples/typeinf.scala b/sources/examples/typeinf.scala deleted file mode 100644 index a9ac59968b..0000000000 --- a/sources/examples/typeinf.scala +++ /dev/null @@ -1,244 +0,0 @@ -package examples; - -object typeinf { - -trait Term {} - -case class Var(x: String) extends Term { - override def toString() = x -} -case class Lam(x: String, e: Term) extends Term { - override def toString() = "(\\" + x + "." + e + ")" -} -case class App(f: Term, e: Term) extends Term { - override def toString() = "(" + f + " " + e + ")" -} -case class Let(x: String, e: Term, f: Term) extends Term { - override def toString() = "let " + x + " = " + e + " in " + f; -} - -sealed trait Type {} -case class Tyvar(a: String) extends Type { - override def toString() = a -} -case class Arrow(t1: Type, t2: Type) extends Type { - override def toString() = "(" + t1 + "->" + t2 + ")" -} -case class Tycon(k: String, ts: List[Type]) extends Type { - override def toString() = - k + (if (ts.isEmpty) "" else ts.mkString("[", ",", "]")) -} - -object typeInfer { - - private var n: Int = 0; - def newTyvar(): Type = { n = n + 1 ; Tyvar("a" + n) } - - trait Subst with Function1[Type,Type] { - def lookup(x: Tyvar): Type; - def apply(t: Type): Type = t match { - case tv @ Tyvar(a) => val u = lookup(tv); if (t == u) t else apply(u); - case Arrow(t1, t2) => Arrow(apply(t1), apply(t2)) - case Tycon(k, ts) => Tycon(k, ts map apply) - } - def extend(x: Tyvar, t: Type) = new Subst { - def lookup(y: Tyvar): Type = if (x == y) t else Subst.this.lookup(y); - } - } - - val emptySubst = new Subst { def lookup(t: Tyvar): Type = t } - - case class TypeScheme(tyvars: List[Tyvar], tpe: Type) { - def newInstance: Type = - (emptySubst /: tyvars) ((s, tv) => s.extend(tv, newTyvar())) (tpe); - } - - type Env = List[Pair[String, TypeScheme]]; - - def lookup(env: Env, x: String): TypeScheme = env match { - case List() => null - case Pair(y, t) :: env1 => if (x == y) t else lookup(env1, x) - } - - def gen(env: Env, t: Type): TypeScheme = - TypeScheme(tyvars(t) diff tyvars(env), t); - - def tyvars(t: Type): List[Tyvar] = t match { - case tv @ Tyvar(a) => List(tv) - case Arrow(t1, t2) => tyvars(t1) union tyvars(t2) - case Tycon(k, ts) => (List[Tyvar]() /: ts) ((tvs, t) => tvs union tyvars(t)); - } - - def tyvars(ts: TypeScheme): List[Tyvar] = - tyvars(ts.tpe) diff ts.tyvars; - - def tyvars(env: Env): List[Tyvar] = - (List[Tyvar]() /: env) ((tvs, nt) => tvs union tyvars(nt._2)); - - def mgu(t: Type, u: Type, s: Subst): Subst = Pair(s(t), s(u)) match { - case Pair(Tyvar(a), Tyvar(b)) if (a == b) => - s - case Pair(Tyvar(a), _) if !(tyvars(u) contains a) => - s.extend(Tyvar(a), u) - case Pair(_, Tyvar(a)) => - mgu(u, t, s) - case Pair(Arrow(t1, t2), Arrow(u1, u2)) => - mgu(t1, u1, mgu(t2, u2, s)) - case Pair(Tycon(k1, ts), Tycon(k2, us)) if (k1 == k2) => - (s /: (ts zip us)) ((s, tu) => mgu(tu._1, tu._2, s)) - case _ => throw new TypeError("cannot unify " + s(t) + " with " + s(u)) - } - - case class TypeError(s: String) extends Exception(s) {} - - def tp(env: Env, e: Term, t: Type, s: Subst): Subst = { - current = e; - e match { - case Var(x) => - val u = lookup(env, x); - if (u == null) throw new TypeError("undefined: " + x); - else mgu(u.newInstance, t, s) - - case Lam(x, e1) => - val a, b = newTyvar(); - val s1 = mgu(t, Arrow(a, b), s); - val env1 = Pair(x, TypeScheme(List(), a)) :: env; - tp(env1, e1, b, s1) - - case App(e1, e2) => - val a = newTyvar(); - val s1 = tp(env, e1, Arrow(a, t), s); - tp(env, e2, a, s1) - - case Let(x, e1, e2) => - val a = newTyvar(); - val s1 = tp(env, e1, a, s); - tp(Pair(x, gen(env, s1(a))) :: env, e2, t, s1) - } - } - var current: Term = null; - - def typeOf(env: Env, e: Term): Type = { - val a = newTyvar(); - tp(env, e, a, emptySubst)(a) - } -} - - object predefined { - val booleanType = Tycon("Boolean", List()); - val intType = Tycon("Int", List()); - def listType(t: Type) = Tycon("List", List(t)); - - private def gen(t: Type): typeInfer.TypeScheme = typeInfer.gen(List(), t); - private val a = typeInfer.newTyvar(); - val env = List( -/* - Pair("true", gen(booleanType)), - Pair("false", gen(booleanType)), - Pair("if", gen(Arrow(booleanType, Arrow(a, Arrow(a, a))))), - Pair("zero", gen(intType)), - Pair("succ", gen(Arrow(intType, intType))), - Pair("nil", gen(listType(a))), - Pair("cons", gen(Arrow(a, Arrow(listType(a), listType(a))))), - Pair("isEmpty", gen(Arrow(listType(a), booleanType))), - Pair("head", gen(Arrow(listType(a), a))), - Pair("tail", gen(Arrow(listType(a), listType(a)))), -*/ - Pair("fix", gen(Arrow(Arrow(a, a), a))) - ) - } - - abstract class MiniMLParsers extends CharParsers { - - /** whitespace */ - def whitespace = rep{chr(' ') ||| chr('\t') ||| chr('\n')}; - - /** A given character, possible preceded by whitespace */ - def wschr(ch: char) = whitespace &&& chr(ch); - - /** identifiers or keywords */ - def id: Parser[String] = - for ( - val c: char <- rep(chr(' ')) &&& chr(Character.isLetter); - val cs: List[char] <- rep(chr(Character.isLetterOrDigit)) - ) yield (c :: cs).mkString("", "", ""); - - /** Non-keyword identifiers */ - def ident: Parser[String] = - for (val s <- id; s != "let" && s != "in") yield s; - - /** term = '\' ident '.' term | term1 {term1} | let ident "=" term in term */ - def term: Parser[Term] = - ( for ( - val _ <- wschr('\\'); - val x <- ident; - val _ <- wschr('.'); - val t <- term) - yield Lam(x, t): Term ) - ||| - ( for ( - val letid <- id; letid == "let"; - val x <- ident; - val _ <- wschr('='); - val t <- term; - val inid <- id; inid == "in"; - val c <- term) - yield Let(x, t, c) ) - ||| - ( for ( - val t <- term1; - val ts <- rep(term1)) - yield (t /: ts)((f, arg) => App(f, arg)) ); - - /** term1 = ident | '(' term ')' */ - def term1: Parser[Term] = - ( for (val s <- ident) - yield Var(s): Term ) - ||| - ( for ( - val _ <- wschr('('); - val t <- term; - val _ <- wschr(')')) - yield t ); - - /** all = term ';' */ - def all: Parser[Term] = - for ( - val t <- term; - val _ <- wschr(';')) - yield t; - } - - class ParseString(s: String) extends Parsers { - type intype = int; - val input = 0; - def any = new Parser[char] { - def apply(in: int): Parser[char]#Result = - if (in < s.length()) Some(Pair(s charAt in, in + 1)) else None; - } - } - - def showType(e: Term): String = - try { - typeInfer.typeOf(predefined.env, e).toString(); - } catch { - case typeInfer.TypeError(msg) => - "\n cannot type: " + typeInfer.current + - "\n reason: " + msg; - } - - def main(args: Array[String]): unit = - Console.println( - if (args.length == 1) { - val ps = new MiniMLParsers with ParseString(args(0)); - ps.all(ps.input) match { - case Some(Pair(term, _)) => - "" + term + ": " + showType(term) - case None => - "syntax error" - } - } else "usage: java examples.typeinf <expr-string>" - ); - -} - |